A secret room hidden in the roots of the Whomping Willow – direct access is via a hatch at the back of the Professor Snape’s Potions classroom (CC3.5, CC3.6, CC3.7).

The last remnants of the Order of the Phoenix, Hermione Granger and Ron Weasley have been hiding here. It is one of several places that has been used since the Battle of Hogwarts to conceal the original supporters of Harry Potter and Albus Dumbledore (CC3.5, CC3.6, CC3.7).